Hint

Answer

ROTS

The letters represent the episode titles of the "Star Wars" series, in order of release:
"A New Hope"(1977)
"The Empire Strikes Back"(1980)
"Return of the Jedi"(1983)
"The Phantom Menace"(1999)
"Attack of the Clones"(2002)
"Revenge of the Sith"(2005)Hide